JSON值反序列化為.NETCore中的C#物件

我正在嘗試從 API (https://localhost:7270/api/GetEmployees) 獲取資料。從 API 獲取所有必需的資料后，我只想反序列化為 C# 物件并需要在 HTML 頁面中顯示。

這是 JSON 資料

"{\"data\":[{\"id\":1,\"firstName\":\"Sandanuwan\",\"lastName\":\"Dharmarathna\",\"address\":\"Kurunegala\",\"dob\":\"2022-08-23T22:20:00\",\"age\":26,\"class\":\"10 B\",\"emailAddress\":\"[email protected]\",\"department\":{\"id\":2,\"departmentName\":\"HR\"}},{\"id\":2,\"firstName\":\"Anna\",\"lastName\":\"Merry\",\"address\":\"London\",\"dob\":\"2022-04-20T00:00:00\",\"age\":23,\"class\":\"7 A\",\"emailAddress\":\"[email protected]\",\"department\":{\"id\":1,\"departmentName\":\"Account\"}}],\"success\":true,\"message\":\"Successfully received all Employees Details\"}"

為了反序列化上面的 JSON 資料，我創建了如下所示的 C# 類。

員工類

public class Employee
    {
        public int Id { get; set; }        
        public string FirstName { get; set; } = string.Empty;       
        public string LastName { get; set; } = string.Empty;    
        public string Address { get; set; } = string.Empty;      
        public DateTime DOB { get; set; }    
        public int Age { get; set; }
        public string Class { get; set; } = string.Empty;    
        public string EmailAddress { get; set; } = string.Empty;     
        public Department Department { get; set; }
    }

部門班

public class Department
    {
        public int Id { get; set; }       
        public string DepartmentName { get; set; } = string.Empty;
    }

根類

public class Root
{
    public List<Employee> Data { get; set; }
    public bool Success { get; set; }
    public string Message { get; set; }
}

控制器索引法

 public async Task<IActionResult> Index()
        {
            List<Root> employeeList = new List<Root>();
            using (var httpClient = new HttpClient())
            {
                using (var response = await httpClient.GetAsync("https://localhost:7270/api/GetEmployees"))
                {
                    string apiResponse = await response.Content.ReadAsStringAsync();
                    employeeList = JsonConvert.DeserializeObject<List<Root>>(apiResponse);
                }
            }
            return View(employeeList);
        }

索引 Html 頁面

<table >
    <thead>
        <tr>
            <th>ID</th>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Date Of Birth</th>
            <th>Age</th>
            <th>Class</th>
            <th>Email Address</th>
            <th>Department</th>
        </tr>
    </thead>
    <tbody>
        @foreach (var r in Model)
        {
            <tr>
                <td>@r.Data[0].Id</td>
                <td>@r.Data[1].FirstName</td>
            </tr>
        }
    </tbody>
</table>

但是在運行 Web 應用程式后，我收到以下錯誤。

An unhandled exception occurred while processing the request.
JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[EmployeeWeb.Models.Root]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path 'data', line 1, position 8.

據我了解，錯誤來自這條線

employeeList = JsonConvert.DeserializeObject<List<Root>>(apiResponse);

所以，有人可以幫我解決這個問題。謝謝

uj5u.com熱心網友回復：

將 apiResponse 反序列化為Root，而不是List<Root>：

List<Employee> employeeList = new List<Employee>();
...
var root = JsonConvert.DeserializeObject<Root>(apiResponse);
employeeList = root.Data;

標籤：asp.net 核心asp.net-web-apiasp.net-web-api2

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